EP0696011A2 - Vorrichtung und Verfahren zur Identifizierung von mehreren Transpondern - Google Patents

Vorrichtung und Verfahren zur Identifizierung von mehreren Transpondern Download PDF

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Publication number
EP0696011A2
EP0696011A2 EP95111245A EP95111245A EP0696011A2 EP 0696011 A2 EP0696011 A2 EP 0696011A2 EP 95111245 A EP95111245 A EP 95111245A EP 95111245 A EP95111245 A EP 95111245A EP 0696011 A2 EP0696011 A2 EP 0696011A2
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EP
European Patent Office
Prior art keywords
bit string
transponder
bit
transponders
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95111245A
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English (en)
French (fr)
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EP0696011B1 (de
EP0696011A3 (de
Inventor
Kurt Orthmann
Andreas Hagl
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Texas Instruments Deutschland GmbH
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Texas Instruments Deutschland GmbH
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Publication date
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Publication of EP0696011A3 publication Critical patent/EP0696011A3/de
Application granted granted Critical
Publication of EP0696011B1 publication Critical patent/EP0696011B1/de
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
    • G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
    • G06K7/10039—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot interrogator driven, i.e. synchronous
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Definitions

  • This invention relates in general to the field of transponder systems. More particularly, the present invention relates to apparatus and method for identifying multiple transponders located in close proximity to one another.
  • Transponder arrangements have been used to detect and uniquely identify, in a contactless manner, objects, animals, or persons being present at selected locations.
  • Transponder systems typically include an interrogation unit which transmits radio frequency pulses and a transponder unit which receives the pulses and responds with stored data in the form of a modulated radio frequency carrier. Because the transponders may be diminutive in size, transponder systems may be used in countless applications. For example, luggage being transported on a conveyor belt may be identified and routed according to the encoded destination at a routing point. Machine components may be identified and transported to specific stations on an assembly line. Movement and activity of animal stock with embedded transponder units may be monitored and recorded in an unobtrusive manner. Personnel may carry identification badges having a transponder unit to gain access to secured areas without having to use a card reader.
  • apparatus and method for identifying a plurality of transponders are provided which eliminates or substantially reduces the disadvantages associated with prior systems.
  • a method for identifying a plurality of transponders located within an inquiry field of an interrogation unit are provided.
  • Each transponder is assigned an unique identification code, and the interrogation unit dynamically constructs and modifies a bit string used to solicit responses from selected transponder(s) until each transponder in the inquiry field is identified.
  • the bit string is transmitted to the transponders, which compares it with the least significant bits of their respective identification codes. A mismatch between the identification code and the bit string results in suppressing the response from the transponder.
  • the method includes the steps of increasing the number of bits in the bit string by adding a bit of a predetermined logic value to a most significant bit position when more than one transponder responds to the transmitted bit string, inverting the logic value of a most significant bit after successfully identifying a transponder, and decreasing the number of bits in the bit string by deleting a bit from a least significant bit position when no more than one transponder responds to the transmitted bit string more than once successively.
  • the interrogation unit has a processor dynamically building and modifying a bit string, and a transmitter transmitting an interrogation pulse including the bit string receivable within an inquiry field.
  • the transponders each include a memory storing an unique identification code, a resonant circuit receiving the interrogation pulse that contains the bit string, a controller comparing the received bit string with least significant bits of the stored identification code, and a de-energizer circuit suppressing the resonant circuit from transmitting a response in response to the least significant bits of the identification code being unequal to the bit string.
  • FIGURES 1-4 of the drawings like numerals being used for like and corresponding parts of the various drawings.
  • FIGURE 1 illustrates an exemplary scenario of multiple transponders 10-16, with identification codes A through D, being simultaneously present in an inquiry field 18 of an interrogation unit 20.
  • Inquiry field 18 represents the area within which the interrogation or power pulses generated by interrogation unit 20 are readily receivable.
  • Inquiry field 18 may contain a continuous modulated or unmodulated radio frequency signal.
  • Transponders 10-16 are capable of receiving the interrogation pulses from interrogation unit 20 and respond thereto with stored data and their respective identification codes. As shown, a transponder 22 located outside of inquiry field 18 does not receive the interrogation pulse and therefore does not participate in transmission of its stored data.
  • interrogation unit 20 sends an RF interrogation pulse.
  • the interrogation pulse energizes a transponder located within the inquiry field, and enables it to respond with stored data.
  • transponders 10-16 are located in close proximity to one another such that they interfere with one another's operations, and that the simultaneous responses from the transponders may not be readable by interrogation unit 20. As a result, the presence of transponders 10-16 are not properly detected.
  • FIGURE 2 a flowchart of the process in which a plurality of transponders located in an inquiry field are identified by dynamic selective addressing is shown. It may be advantageous to the understanding of the TRANSPONDER ID A X0001 B X1000 C X0100 D X1100 present invention to also refer to a specific example of transponder identification codes as the logic flow is described.
  • the exemplary identification codes of the transponders are as follows, where "X" represents the most significant bits of the identification code:
  • interrogation unit 20 sends an interrogation pulse, as shown in blocks 30 and 32.
  • a read cycle is then initiated to receive the responses from the transponders, as shown in block 34. If the responses are unrecognizable or unreadable, then a determination is made that more than one transponder are present in inquiry field 18, as shown in block 36. If there are more than one transponder present, then an initiation of a counter, COUNT , and a selection bit string is performed. As shown in block 38, COUNT is initialized to zero, and the selection bit string is initialized with a zero bit.
  • the identification codes of the transponders may be uniquely assigned 64-bit bit strings where, in most applications, the transmission of a small number of the least significant bits is sufficient to uniquely identify the transponders.
  • interrogation unit 20 sends an interrogation pulse including the bit string and the identification bit string of any successfully read transponders.
  • the identification code or bit string of successfully read transponders may be stored in a memory and deleted after a predetermined time period to enable the detection of a re-entry into the inquiry field.
  • selection bit strings that have been transmitted in the selection procedure are also stored in memory and deleted after a predetermined amount of time.
  • each transponder 10-16 Upon reception of the interrogation pulse with the bit string, each transponder 10-16 compares the bit string with the least significant bits of its own unique identification code. In this case, since the bit string is "0", those transponders with identification codes ending in “0" respond to the interrogation pulse, and those transponders having identification codes ending in "1" do not respond. Therefore, transponder A with its identification code ending in "0001" is prevented from sending its reply, and transponders B through D send their responses and their identification codes.
  • the read cycle of interrogation unit 20 once again tries to read the transponder responses, as shown in block 42. However, it discovers that there are more than one transponder present, as shown in block 44.
  • the selection bit string must again be modified to progressively select the remaining transponders. Since it is determined, in block 44, that only one transponder responded to the "000" bit string, execution proceeds to block 50 where the bit string is examined to determine whether it is only one bit long. The bit string contains three bits presently, therefore execution proceeds to block 52. In blocks 52, the counter, COUNTER , is checked to determine whether it is greater than zero. If it is not, as in this case, then the counter is incremented by one in block 54, and execution proceeds to block 58, where the most significant bit of the bit string is inverted. The resultant bit string becomes "100". The new selection bit string is checked to determine whether it has been used previously. This bit string is then transmitted with the interrogation pulse.
  • the identification code of the successfully read transponder is also sent to deselect transponder B. Note that although the format of the interrogation pulse is not explicitly described herein, it necessarily follows that some format is used in which the successfully read transponder identification codes may not be confused with the selection bit string.
  • both transponders C and D respond, since both of their identification codes end with this bit string.
  • the determination in block 44 is therefore answered in the affirmative, and the counter, COUNT , is reset in block 46.
  • a "0" is added to the selection bit string to form "0100”.
  • This new bit string is sent with the identification codes of successfully read transponders, resulting in suppressing responses from transponders A, B, and D, and the selection of transponder C.
  • Transponder C is therefore detected and identified in block 42.
  • the bit string is examined to determine whether it is only one bit long.
  • COUNT is incremented, as shown in block 54.
  • block 58 the most significant bit of the selection bit string is inverted to form "1100". Since this new bit string has not been used previously, it is transmitted in an interrogation pulse resulting in the selection and identification of transponder D.
  • transponder A When the selection bit string "1" is transmitted, transponder A responds since its least significant bit is "1". Therefore, transponder A is identified and read in block 42. In blocks 44 and 50, it is determined that there is not more than one transponder and the bit string length is only one bit long. Accordingly, execution stops. In this manner, all four transponders are identified and their respective data are read.
  • the selection bit string sequence generated by the procedure and the resultant transponder selection are as follows:
  • bit strings are constructed and manipulated according to an algorithm which is capable of singling out all the transponders present in the inquiry field. Because the algorithm operates on bit strings, it accomplishes the task faster than one that selects and compares on a bit-by-bit basis. Furthermore, since the identification codes of successfully read transponders are also transmitted along with the selection bit string, a faster detection of yet undetected transponders is possible.
  • transponders 10-16 are so close to each other as to cause a large shift in the resonance frequency of their transmissions, it may be necessary to determine the resonance frequency of the transponders. This may be performed by reckoning or measuring and comparing the change in length of the transponder responses due to the shift in resonance frequency to arrive at a new resonance frequency.
  • the interrogation unit then transmits an interrogation pulse at the computed resonance frequency to achieve a full loading of all the transponders in the inquiry field and communication therewith.
  • Interrogation unit 50 includes a microprocessor 52 which is responsible for the control of the function sequences.
  • Microprocessor 50 is coupled to a memory 54, which may include the aforementioned queue used for storing the identification codes of recognized transponders.
  • a transmitter 56 and receiver 58 Further included are a transmitter 56 and receiver 58.
  • Transmitter 56 and receiver 58 may include a radio frequency (RF) oscillator (not shown) and a resonant circuit (not shown.
  • RF radio frequency
  • FIGURE 4 is a simplified block diagram of an embodiment of a transponder 70.
  • Transponder 70 includes a resonant circuit 72 coupled to an energy accumulator 74.
  • Resonant circuit 72 may include a receiving coil (not shown) coupled in parallel with a first capacitor (not shown).
  • Energy accumulator 74 may include a second capacitor (not shown) coupled in series with resonant circuit 72.
  • a controller 76 with memory 78 are also provided. Controller 76 may receive input signals from a sensor (not shown) indicative of certain physical parameters of the environment, for example ambient temperature and pressure, and store it in memory 78 for transmission to the interrogation unit.
  • the unique identification code of the transponder also may be stored in memory 78.
  • a response formulator 80 may read memory 78 to formulate the code pattern responses to the interrogation pulses.
  • a deenergizer circuitry 82 controlled by controller 76 is further provided for shorting, discharging, or by-passing energy accumulator 74 in response to receiving an interrogation pulse containing the least significant bits of its identification code. De-energizer circuitry 82 therefore acts to suppress the transponder's response so that it may not respond to the interrogation pulse. Details of an embodiment of the transponder circuitry are described in above-identified U.S. Patent No. 5,053,774, titled Transponder Arrangement .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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EP95111245A 1994-07-27 1995-07-18 Vorrichtung und Verfahren zur Identifizierung von mehreren Transpondern Expired - Lifetime EP0696011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/282,095 US5489908A (en) 1994-07-27 1994-07-27 Apparatus and method for identifying multiple transponders
US282095 2002-10-29

Publications (3)

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EP0696011A2 true EP0696011A2 (de) 1996-02-07
EP0696011A3 EP0696011A3 (de) 1997-08-13
EP0696011B1 EP0696011B1 (de) 2002-10-16

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US (1) US5489908A (de)
EP (1) EP0696011B1 (de)
JP (1) JPH0862328A (de)
CA (1) CA2153121A1 (de)
DE (1) DE69528558T2 (de)

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FR2774495A1 (fr) * 1998-02-04 1999-08-06 Sgs Thomson Microelectronics Procede d'identification de cartes electroniques presentes dans une zone d'investigation
EP0942386A1 (de) * 1998-03-12 1999-09-15 Commissariat A L'energie Atomique Verfahren und System zum mehrmals Lesen einer Sammlung von Etiketten mit verschiedenen Identifikationskoden
FR2776097A1 (fr) * 1998-03-16 1999-09-17 Sgs Thomson Microelectronics Procede perfectionne d'identification de cartes electroniques
EP1024451A1 (de) * 1999-01-26 2000-08-02 Siemens Aktiengesellschaft Lesegerät für tragbare Datenträger
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CA2153121A1 (en) 1996-01-28
JPH0862328A (ja) 1996-03-08
US5489908A (en) 1996-02-06
DE69528558T2 (de) 2003-03-06
EP0696011B1 (de) 2002-10-16
DE69528558D1 (de) 2002-11-21
EP0696011A3 (de) 1997-08-13

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